Supplementary heating unit



ch33, 1933. v

SUPPLEMENTARY HEATING UNIT Filed March 26, 1931 2 Sheets-Sheet 1 gwwzwtoe HecZork Laugh I Oct. 31, 1933. v LQUGH 1,932,793

SUPPLEMENTARY HEATING UNIT Filed March 26, 1931 2 Sheets-Sheet" 2 Patented Oct. 31, 1933 SUPPLEMENTARY HEATING UNIT Hector V. Lough, Plainfield, N. J.

Application March 26,

6 Claims.

This invention relates to improvements in supplementary heating units which are intended for installation in a steam or hot water boiler. It is frequently found that the heat absorbing surfaces of heating boilers is too far removed from the source of the heat for effective operation. This is especially true where boilers originally designed for the use of coal or other solid fuel have been converted for use with oil or other fluid fuels. In these cases the fire travel before coming in contact with the heat absorbing surfaces is sometimes quite extensive and the travel of the heated gases in contact with the heat absorbing surfaces may be too short to cause the full absorption of heat with a consequent loss of heat through the chimney.

In order to improve the efficiency of such boilers it is necessary to provide a supplementary heating unit which is adaptable to the dimensions and the purposes of the boiler and which will permit utilization of such heating elements as may be best fitted for the particular characteristics of the boiler under consideration. For example, the heat absorbing plates of some boilers are nearer the level of the fire door than in other boilers. Again there is wide variation in the position, arrangement and size of the fire doors while the fire pot itself may be of different forms and'subiect to possible partial obstruction.

It is an object of my invention to provide a supplemental heating unit which may be mounted within the fire door of the boiler in most efiective relation to the heating surfaces or headers and to the fire itself. The unit is connected to the water supply of the boiler and discharges independently of the action of the boiler. The unit provides for the production of steam in a minimum of time and considerably before the development of steam by the boiler proper. The arrangement of the unit includes means by which its circulation of feed water is accomplished without involving all of the main water supply in the boiler so that the production of steam is not delayed by heating this main water supply- By including a steam separating means in the discharge or the unit and with delivery back to the heating unit,'the efiect of the heat is concentrated on a small volume of water resultingin a very quick rise tosteam temperature. My improved unit is adapted to installation in fire doors irrespective of the form, arrangement or size of the latter.

It is a further object of my invention to install such a heating unit without permanently closing up the fire door. On the contrary it is an object 1931. Serial No. 525,571

of my invention to provide substanially unrestricted access to the fire pot through the doorway.

Among the objects of my invention is the provision of a header and associated heating loops or coils which latter may be selected to conform to the size and shape of the fire pot and arranged to be adjusted in the most eflicient grouping.

It is a further object of my invention to provide a heating coil or loop which may be firmly held in the header and yet readily move with respect to the latter in order to give access within the fire pot for cleaning, adjustment in the position of the loops or possible removal of one or more loops for the purpose of replacement.

Other advantages of my invention will be evident from the following description of the preferred form of my improvement as illustrated. I have shown my invention in the accompanying drawings in which, 4

Fig. 1 is a front elevation of an upright steam boiler to which my improved heating unit has been applied;

Fig. 2 is an enlarged fragmentary vertical elevation showing the means of mounting the heating unit;

Fig. 3 is a plan view partly in section on the line 3-3 of Fig. 1;

Fig. 4 is a vertical section of the header on the line 44 of Fig. 3, and

Fig. 5 is a vertical transverse section of the header and one coil on the line 55 of Fig. 4.

As illustrating one form which my improved heating unit may take, I have shown in Fig. 1 a nupright steam boiler '7 mounted on the customary base and-having at. the top of the boiler the steam discharge pipe 8 connected to the delivery line 9. At the base of the boiler I have shown the return pipe 10 leading from the return line 11. Inthe view shown in Fig. 2 the door frame casting 12 extends outwardly to form the outer extremity of the fire door 13.

I use a side plate 14 made of cast iromor the equivalent and considerably longer than the height of the doorway 12. This side plate is the lower one 19 having a cam or slope 21 inwardly and downwardly toward the fire door.

The side plate 14 has a rectangular opening through it in which the header is supported in vertically adjusted position dependent upon the arrangement of the doorway 13 to the fire space of the boiler.

The hinge lugs 18 and 19 form the support for a door plate 21 which by means of the cam slope 20 on lug 19 is biased to closed position across the doorway 13. The door plate 21 is vertically slotted as shown in 22. On the inner wall of the door plate and in line with the slot 22 is an adjusting groove 23 extending vertically beyond the'ends of the slots 22.

An adjusting plate 24 is provided with lugs 25 which may be held somewhat loosely within the groove 23.

The adjusting plate 24 also has loosely riveted to it a bolt 26 which projects through the slot 22 and a screw threaded to receive the adjusting bolt 27 and washer 28. In this way the adjusting plate may be moved vertically with respect to the slot 22 and fastened in the desired position. As the contact between the door plate 21 and the adjusting plate 24 is mainly by the lugs 25, 25, it follows that the plate 24 may rock slightly with respect to the door plate 21 and thus insure that the door is brought into close fit with the outer surface of the door frame 12.

The adjusting plate 24 carries four corner bolts 29, 29 by which the door 30 is suspended from the adjusting-plate 24. This door 30 is made of some easily worked fire resistant material such as reinforced asbestos board or the like. The door is supplied considerably over-size so that it may be cut down to fit the exact proportions of the door frame 12 and be mounted in close fitting adjustment thereon by means of the adjusting plate 24 and its connection to the door plate 21.

A header noted generally by the numeral 31 is provided with an outer vertical tubular extension 32 by means of which water is supplied to and steam withdrawn from the header. The middle section 32 of the header is rectangular in crosssection and fits the recess provided in the side plate 14 by which latter it issupported.

Within the fire door 13 and on the sill thereof, the header 31 is supported by means of a strut 33 having a vertical pillar 34 bolted adjustably within lug 35 on the side of the middle section 32 of the header.

In this way the header issupported within the doorway as the desired height made necessary by the conditions within the fire pot. It is to be understood that the header will ordinarily pass through the upper corner of the doorway 13 as shown in Fig. 2 but if the ordinary header walls of the boiler project below the level'it is possible by adjustment of the side plate'14 and the strut 33 to lower'the header, When this is done the door 30 is correspondingly raised with respect to the door plate 21 so that the plate 30 willremain in registry with the door frame12.

, The inner end 36 of the header is expanded as shown in Figs. 3 and 4. The section 32 has a hori-, zontal partition 3'7 which extends into the end 36 and .forms an upper chamber 38 and a lower chamber 39.

y The top wall 40 overhangs one side wall of the end 36 to form a lateral passage-way 41 the bot tom of which has a series of ports 42.

The ports 42 and 45 are arranged to receive elbows or joints 46 which have spherical ball or otherwise ground ends adapted to form watertight connections with the ports 42 and 45. The elbows 46, 46 have opposing bosses 47, both of which are drilled and one of which is screw threaded internally. An adjusting bolt 48 is held in the lower boss 47 and has a screw threaded end fitting in the opposite boss. By this means the elbow joints 46, 46 after being brought into position opposite the ports 42 and 45 may be spread until the joints are water-tight.

The lateral ends of the elbow joints 46, 46 connect with the ends of a flexible metal coil 49 the midportion of which forms a loop 50.

By reference to Fig. 3 it will be observed that the coils or loops 49, 50 may be of graduated sizes and angular arrangements so that they may be fitted into the area of the fire pot and thus present a maximum of area to the heat.

It is also to be noted that the loops are so arranged that one may overlap or telescope within the space occupied by the adjacent ones. In this way the several loops may be crowded together to leave part of the area open for cleaning or adjusting purposes.

The upper end of the tubular member 32 is connected by piping 51 to a steam dome 52 which in turn is connected by piping 53 to the steam line 9. A return pipe 54 runs from the steam dome 52 to a pipe 55 which connects the return line 11 with the lower end of the member 32. The provision of a chamber 52 afiording opportunity for the separation of the steam from the water as delivered by the supplementary heating unit and the provision for the return 01 such hot water to the inlet side of the unit without admixture with the boiler water, increases greatly the speed of steam production.

The partition 37 extends transversely of the member 32 and thus insures the circulation of water into the lower chamber 39 and out of the upper chamber 38.

. The above described arrangement provides for a convenient installation of a supplementary heating unit in a boiler of the present type. The heating unit is supported at one side of the fire door only. The fire door is, therefore, available both for installation and during service. The header may be vertically adjusted and the door 30 correspondingly fitted to the existing door frame 12. In case of explosion the door 30 is free to give outwardly.

The interior arrangement of the heating unit provides for a header at one side of the fire-pot and for the individual installation and adjustment of the separate coils. The latter by reason of their own resiliency are sprung into contact with the ports in the header and subsequently adjusted into the desired position and watertight connection.

While I have indicated one form which my invention may take, it is to be understood that the scope of the invention is limited only as required by the following claims. v

1. In combination with a boiler having a doorway and circulating piping connected with the boiler, a side plate, means for fastening the side plate on said doorway, a doormounted on the side plate, a header passing through the side plate, heat absorbing members carried by the header within the boiler and means discharging steam from the header into the circulating pip- 1 8- 2. In combination with a boiler having a doorway, and circulating piping, a side plate, means for fastening the side plate on the doorway, a header passing through the side plate, heat absorbing members carried by the header within the boiler, an inlet to the header from the return of the circulating piping, a discharge from the header, a steam separator on the discharge, said steam separator being connected to the circulating piping and to the return piping.

3. In combination with a boiler having discharge and feed piping in circulation therewith, a header supported within the boiler and having a water connection to said header and a discharge connection from the header above the water level of the boiler, said header having superposed inlet and outlet passageways, oppositely directed inlet and outlet ports on the header communicating with said passageways and steam generating coils connected vertically between said inlet and outlet ports.

4. In combination with a boiler having dis-' charge and return piping in circulation, a header supported within the boiler and having outside connections with the piping, said header having a series of pairs of inlet and outlet ports, coils having end connections, the connections of each coil seating in a pair of ports and the coils being adjustable into overlapping relation.

5. In combination with a steam boiler having a steam discharge and a water inlet, a supplementary heat absorbing unit within the fire chamber having a feed connection with the water filled portion of said boiler, a discharge connection to the said steam discharge above the water level and means for separating and returning water from said discharge connection to said unit.

6. In combination with a boiler having a steam discharge, a supplementary heating unit connected to the water supply in the boiler, said heating unit comprising heat absorbing elements arranged within the area of said boiler, a steam dome connected with said heating unit, a water return passageway from said steam dome and a discharge for the steam from said dome into the steam discharge from the boiler.

HECTOR V. LOUGH. 

